Public Accounts Volume 1 — Consolidated Financial Statements
Province of Nova Scotia
Notes to the Consolidated Financial Statements
As at March 31, 2023
11. | Liabilities for Contaminated Sites (continued) |
The Province’s estimates for remediation are based on environmental studies, engineering reports, and if appropriate, extrapolation techniques similar to those used for other contaminated sites with which the Province was involved. These estimates have been measured on an undiscounted basis. As at March 31, 2023, the Province has identified and continues to track approximately 188 sites in total. Of these, 99 were identified as sites where action is likely and for which a liability was recorded, including the following:
Boat Harbour in Pictou County
As at March 31, 2023, a liability of $350.1 million (2022 – $314.2 million) has been recognized for the remediation of effluent on site. At this stage in the process, the Province continues to test and refine its current remediation strategy, and as a result, there remains significant measurement uncertainty related to this estimate. A comprehensive remediation plan is under review by the federal regulator, and an approval decision is still pending.
The federal government has committed to reimbursing the Province for up to $100.0 million in eligible remediation costs incurred on this project. This federal commitment has not been reflected as part of the Boat Harbour remediation liability but has been disclosed as a contractual right in Note 12 e) and is expected to result in revenue in future periods as the remediation is completed.
Sydney Steel Corporation (SYSCO) and Adjacent Sites including the Sydney Tar Ponds/Coke Ovens Site As at March 31, 2023, a liability of $57.2 million (2022 – $59.5 million) has been recognized for future decommissioning, demolition, and remediation of SYSCO’s and adjacent sites, including the long-term maintenance and monitoring of the Sydney Tar Ponds/Coke Ovens site expected until 2039.
Abandoned Mine Sites
The Province is responsible for the risk management and potential remediation of certain historic abandoned mines that exist on Crown land. For most of these mine sites, the companies that caused the contamination no longer exist. The mining operations were primarily comprised of gold and other metals, coal, gypsum, and limestone. The risk of contamination at these sites primarily comes from mine tailings and other possible contaminants that were left on site.
As at March 31, 2023, a liability of $117.9 million (2022 – $65.5 million) has been recognized for the remediation of abandoned mine sites. The Province has identified seven former mine sites (five gold, one coal, one celestite) where contamination is known to exceed an environmental standard. A liability of $90.9 million (2022 – $65.5 million for two gold mine sites) has been recognized for these seven sites. A liability of $27.0 million (2022 – $nil) has also been recognized for the remaining 53 former mine sites based on the Province’s assessment of risk using past experience and assessments performed on other similar sites. While remediation is expected in the future, further testing and evaluation is required to determine the extent of contamination and possible site management options. These liabilities will be revised when the extent of future remediation is known, and the future costs can be more precisely measured.
At year-end, detailed site assessments were underway for five additional former gold mine sites located on Crown lands where contamination is expected to exceed an environmental standard. The Province will continue to provide notification in accordance with the Contaminated Sites Regulations as required.
Other Contaminated Sites
As at March 31, 2023, a liability of $14.2 million has been recognized for various other contaminated sites associated with highway maintenance, commercial, and industrial operations.